Liquid-meter.



J. W. LEDOUX.

LIQUID METER.

APPLIOATION FILED JULY 10, 1913.

Patented Feb. 23, 1915.

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ATTORNEY.

J. W. LEDOUX.

LIQUID METER.

APPLIGATION FILED JULY 10, 1913.

Patented Feb. 23, 1915.

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I 4 i w a/ 10 WITNESSES: IIVI/E/VTOI? A TTOR/VEY.

* rrnn smar s rarer orrnon JOHN w. Lnno'ox, or PHILADELPHIA, rmnxtsrnvnnra LIQUID-METER.

menace.

Specification of Letters Patent.

Patented n t. ea, leis.

. Application filed Jul 10, 1913. Serial n. 778,365

To all whom it may concern:

Be it known that ll, JOHN W. LEDOUX, a citizen of the United States, residing in the city of Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented certain Improvements in Li uid- Meters, of which the following is a spec fica tion.

My invention is a meter designed to measme liquid flowing through a weir and it comprises, in its preferred construction, the combination with a weir, of means for differentiating the pressure due to the differences in depth or head of the liquid flowing 5 therethrough and, thereby eflecting the movement of a float and the operation of mechanism for indicating the rate and quantity offlow. e

The characteristic features of my invention are fully disclosed in the following description and the accompanying drawings in illustration thereof.

Inthe drawings, Figure l is a part sec- ,tional elevation of my im rovements apg5 plied to a Weir of V-shape cross section;

Fig. 2 .is a part sectional elevation of the construction applied toa weir of rectangular cross section; Fig. 3 is a part-sectional elevation nepresentmg. asecond modification;

Fig. i 1s a part sectional elevation repre senting a third modification; and Fig.5 isv an elevation of a form of rn'echanism for indicating the rate and quantity. p

The mechanism, as illustrated in Fig. 1,

as comprises an outlet box 1 containingthe weir 2 in theform of a ti-notch, in combination with. a casing 3 connected by a pipe 4 with the box 1 at a point below the bottom of the weir and by a pipe 5 connected with the to box below the level of the weir by a coupling 5, the pipe 5 having an open end at thel evel of the bottom of the weir. The casing3 contains the hollow float 6 connected with therod 7 which is movable to vertically in the guides 8 and connected with the cord 9 passing over a sheave '10 to a counter balancing weight 11,.the sheaye being fixed on the indicator shaft 12 journaled in the casing.

to The pipe 4=has the vertical section 4' which extends upwardlyihrough the bottom of the casing 3 andthe stationary displacing device 3' therein, so as to communicate with the interior of the float 6. body of auxttr liq i of i j et pe e ra i y from that to be measured, is contained in the casing 3, and in this auxiliary liquid the float 6 is immersed to a greater or less'depth depending upo'n' the depth of the liquid to be measured, flowing through'the weir 2. When the surface of the liquid in the box 1 is level with the top of the pipe 5 and the bottom of the weir-2 so that the. pressures transmitted through the pipes 4 and 5 to the interior and exterior of the float 6 are equal,

j when there is noflow through the weir, the

level of the auxiliary liquid in the casing 3, within and without the float, is the same, and, as the depth of the liquid flowing through the weir increases, the float 6 rises a distance which is proportionate to themcrease in the quantity of flow, so that the elevation" of the float will indicate the quantity flowing, the cross sections of the float bearing a functional relation to those of the weir.

As shown in ltig. 2, the box 1' is provided with a notch or weir 2, of rectangular cross section, and the casing 3, connected with the box by pipes 4, 5, and 5, contains the hollow float 6 which is' connected with the rod 7 movable in guides 8, the rod. being connected with the cord 9 passing'over the sheave 10 to the weight 11, and'the sheave being fixed on the indicator shaft'12 jourv naled in the casing.

The cross sections of the hollow float 6, subject to submergence in the heavier liquid 13, bear a functional relation to the cross sections of the weir 2', so that the distance of the floatsmovement'in such liquid shall be proportionate to the increase in the quantity'of liquid flowing through the weir. The float is at its lowest position of greatest submergence with the. heavier liquid interior and exterior thereto at a common level when there is no flow through the weir, and it rises from its lowest position as the pressure communicated through the plpe 4 increases,

with the rise of the liquid in the weir, the

pressure communicated through the pipe remaining constant.

As illustrated in Fig. 3, the box 1, containing the weir 2, is connected, at a point below the weir, with'the casing 3 by a pipe 4* having'a section 4" extending downwardly into the casing and by a pipe5 having a branch 5 the top of the pipe 5 being open at the level of the bottom of the weir. A recessed float 6?, movable in the casing 3*, is connected by a rack 7 a with thepinion 10 which is fixed on the journaled shaft 12, the chamber containing a liquid 13, as .oil,

lighter than the liquid to be measured. The cross sections of the float 6 movable in the "'oilI3 (which is held in the top of the easthrough the pipes 4 ands)- are of such ing 3. by the heavier liquid communicated character that the float will move downwardly from itshighest position (when thereis no flow through the weir and the pressures communicated through the pipes 4 and 5 are equal) adistance proportional to the quantity of liquid flowing through the weir.

Y As illustrated in Fig.4, the box 1, having the weir 2, is connected, at a point below the weir, with the casing 3", by a pipe 4 and a pipe 5 having abranch 5 joinedto the box and a section 5 extending into the casing, the top ofthe pipe 5 being open so as to discharge at' the level of the bottom of the weir.

A hollow float 6 into which the section- 5 extends,'is connected through the rod 7 with the cord 9 which passes over the sheave 10 to the counter weight 11, the sheave bestant pressure communicated through the pipe 5. The cross sections of the float are of .such character that the distance it moves is pro ortionate to the change in the quantity 0 liquid flowing through the weir.

vThe movement of the sha t 12 by the corresponding float operates a known form of 'iin'dicating mechanism adapted for showlng t5 roportional to the 1.46th power of the head.

the rate and, quantity of the flowing liquid. The mathematical designof the' float is determined 's'follows: It is known that the quantity offfwater passing over the weir is proportional to the 2.5th power of the head, where the weir is trian ular, and where the weir is rectangular the ow over the same is By the invention, the movement of the float is alsoproportional, for the triangular weir, to the 2.5th power of the head, and, where the weir is rectangular, to the 1.46th power of the head. As the volume of the auxiliary liquid above or below the given datum is equal to the volume of'the float above or below the same datum, by means of the differential calculus it is proven that for the triangular weir,'where the variable pore tion ofthe float is on the inside, the formula ecomes:

. A Y= 1 a x and where the variable portion of the float is on theoutside,becomes:

and for the" rectangular weir, where the variable portion is on the inside, becomes:

and where the-variable portion is on the outside becomes:

where Y is the radiusof the variable portion of the float and Xis the movement of the float above or below a given datum and where A and B are constants..-

Having described my invention, I claim:

. 1. In a meter, the'combination with a weir,

of a casing, a pipe connecting said casing withthe liquid flowing over said weir at a pointfbelow the same, means comprising" apipe connected with the casing by which a' constant pressure is communicated to the latter, a hollow float movable in said casing, and a sealing liquid in said casing separating the liquid introduced throu h said pipes, saldsealing liquid being of ifierent 'specific gravity from"said first named liquid and regulating the movement of said float,

2. The combination of a casing, a hollow float movable in said casing, a sealing liquid in said casing in which said float is adapted to be immersed, means forcommunicating constant pressure to said casing exterior to said float, means for conveying a different pressure which is a function of the head of the liquid to be measured to said casing within said float, and means for indicating the movement, of said float, said sealing from said second liquid.

0 3. The hombination with a device containf mg a we1r,.of a casing, a float movable in;

IBil

said casing, a liquid heavier than that lit me -liquid beingof different specificgravity to be measured in said casing in which duits is separated by said heavier liquid,'and

said conduits communicate different pressures to the interior of said casing and having a resultant which is a function of the depth of the liquid in the weir.

4. The combination of a device having a weir for discharging liquid to be measured, a casing containing a liquid heavier than that in said device, a float movable in said casing, said float containing a recess sealed by said heavier liquid, and conduits connecting said device with said casing interior and exterior to said float, said conduits being connected with said device below said weir and one of said conduits being adapted to discharge so that a constant pressure is communicated to said casing therethrough.

5. The combination of a liquid conduit provided with a weir, a casing, ducts connecting said conduit with the interior of said-casing, one ofsaid ducts being adapted to discharge at a predetermined level above its connection with said casing, a sealing liquid in said casing of difierent specific gravity from said first named liquid, and a hollow float movable in and sealed by said sealing liquid and indicating mechanism opllltlt erated by said float, said float having variable cross sections bearing a functional relation to the cross sections of said weir and one of said ducts extending into said float so as to be separated by said sealing liquid from the other of said ducts.

6. In a meter, the combination with a liquid conduit having a triangular weir, of a casing, a duct connecting said conduit with said casing whereby pressures are communicated to said casing variable with variations in the depth of liquid in said weir, a second duct for communicating pressure to said casin a liquid in said casing of different speci c gravity from that in said conduit, and means comprising a float movable under control of said liquid in said casing by the differentials of the pressures communicated through said ducts, said float being a figure of revolution and having a radius which is a function of the six-tenth power of the movement of said float, whereby the movement of said float is directly proportional to the flow through said conduit.

In testimony whereof I have hereunto set my name this 8th day of July, 1913, in the presence of the subscribing Witnesses.

JOHN w. LEDOUX.

Witnesses:

Jos. G. DENNY, Jr. C. N. BUTLER. 

